JPH06570A - Method and device for producing nail having eccentric circular head - Google Patents

Abstract

PURPOSE: To provide a method and apparatus capable of efficiently and cost effectively making mass production of wire nails having circular offset heads unified to a strip shape to be used in a power nailing machine with ease of uniformity. CONSTITUTION: The nail production apparatus 10 includes a stationary jaw 30 and moving jaw 32 for clamping a malleable wire, cutting jaws 70 and 72 for bending the wire at a prescribed length and cutting the wire so as to form the point ends of nails on four surfaces to remain the stub and a punch for shaping the circular offset heads by pushing the stub left by bending into the cavity within the clamping jaws. Long grooves for embracing the wire disposed within the clamping jaws 30 and 32 turn to a cylindrical shape when both are butted against each other and since the central axis thereof is offset to the stationary jaw 30 side in the embodiment, the burrs produced by molding are offset from the center of the shank of the nail and are, therefore, not obstructive at the time of making the nails uniform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for manufacturing a nail having an elongated shank and an eccentric head from a malleable wire such as carbon steel wire. The nail head has a peripheral edge which, when viewed axially, conforms to a perfect circle, defining an axis that is parallel but radially offset with respect to the axis defined by the nail shank. Has a rim.

[0002]

BACKGROUND OF THE INVENTION Typically, when used in pneumatic or internal combustion powered nail driving tools, wire nails having a D-shaped or other head that is not perfectly circular may be adhesive coated tape or other The alignment media is aligned to form strips. The aligned nail shanks are oriented in parallel closely spaced relation to each other, with the head of one nail being the head of another nail except at one end of the strip. Lying on.

[0003]

From a performance and aesthetics point of view, it is highly desirable to use a wire nail with a circular eccentric head in the strip. In particular, it has proven very difficult to develop an efficient and economically viable method for manufacturing wire nails in high-volume production streams.

A wire nail with a circular eccentric head aligned with the strip is disclosed in US Pat. No. 3,358,822, but does not disclose how to manufacture the nail.

A wire nail with a circular eccentric head and an apparatus for making the nail are shown in US patent application Ser. No. 07 / 597,025 dated October 15, 1990. The device disclosed therein must be precisely adjusted,
This fine adjustment is difficult and may not be entirely satisfactory for producing the nail in high-volume production streams.

[0006]

Several operations are included in the novel method. The wire is clamped by a clamp mechanism which limits the clamp axis such that the length of the wire projects axially from the clamp mechanism. The protruding portion of the wire to be clamped is bent at an acute angle to the clamping axis, for example about 20 °. The leading portion is cut from the bent portion of the wire to be clamped, leaving the bent stub protruding from the clamping mechanism at a similar angle. The pointed end is then formed in the leading portion at the cutting location as the leading portion is cut. The nail head is formed from a bent stub of wire that is clamped. After the nail head is formed, the wire is released from the clamping mechanism,
The wire is fed axially until a predetermined length of the wire projects axially from the clamping mechanism. These operations are repeated to form the nail shank and head from the leading portion that is cut in each iteration.

In the preferred mode for performing these operations, the wire is clamped by a clamping mechanism which defines a head forming cavity when the wire is clamped. Thus, when the head is formed, the stub is pushed into the void and is deformed when pushed. Optionally, the cavity has an edge that, when viewed in the axial direction, conforms to a perfect circle, defining an axis that is parallel to the clamping axis but that is radially offset from the axis. The stubs project towards an axis defined by the hollows before the neck head is formed. The curved stub has a volume sufficient to form a head when the stub is compressed in the cavity.

Preferably, the curved stub is engaged with a punch having a surface that extends at least as far as the edge of the cavity in all radial directions from the axis defined by the cavity. The punch surface is preferably moved in a direction parallel to the parallel axes so as to push the stub into the cavity and deform the stub as it is pushed.

The keyway may be formed along the wire where the wire is clamped by the clamping mechanism.
The keyway prevents relative rotation between the wire and the clamping mechanism and performs another important action.

The present invention provides a novel apparatus having components for performing the various operations of the novel method. These components can be replaced by the well-known components of commercial nail making machines.

In the new device, a clamping mechanism is used. The clamp mechanism may include clamp jaws arranged to be relatively movable between a closed configuration and an open configuration. The clamp jaws are arranged to clamp the wire in the closed configuration and release the wire in the open configuration. In the closed configuration, the clamp jaws define a head forming cavity with edges that match a perfect circle.
The cavity defines an axis that is parallel to the clamp axis but radially offset from it.

The novel apparatus may comprise a punch having a surface extending at least as far as the edge of the cavity in all radial directions from the axis of the cavity. The punch is preferably movable in a direction parallel to the parallel axes so that the stub is pushed into the cavity by the punch surface and deforms the stub as it is pushed.

Preferably, in the new device, the cutting jaws are arranged so as to be relatively movable between an open configuration and a closed configuration. Further, preferably, the bending fingers project from one of the cutting jaws to bend the protruding portion of the wire when the cutting jaws are partially closed. The cutting jaws cooperate to cut the bent portion of the wire when the cutting jaws are fully closed. The cutting jaws may be arranged such that when the leading portion of the wire is cut from the bent portion of the wire to be clamped, it forms a sharp end on the leading portion at the cutting location.

These and other objects, features and advantages of the present invention will become apparent from the following description of the preferred mode for carrying out the novel method and the preferred embodiment of the novel apparatus with reference to the accompanying drawings. Is.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT As shown in FIGS. 1-9, a device 10 comprises a malleable carbon steel wire 20 of predetermined uniform diameter and intermediate length and an elongated shank 14 having a conventional four-sided tip 16 and a circular shape. Is suitable for carrying out the novel method provided by the invention for producing a nail 12 with an eccentric head 18 of An exemplary nail 12 formed with device 10 by this novel method is shown in FIG.

The device 10 includes a clamping mechanism 22 having novel features and a cutting mechanism 24 having novel features. The clamping mechanism 22 and the cutting mechanism 24 are clamp cutting mechanisms conventionally provided on known types of nail making machines, such as the Wafios model N51 nail making machine commercially available from Wafios Machine Fabric GmbH of Reutlingen, Germany. Replaced with. The apparatus 10 comprises a punch 26 (FIGS. 3 and 4) similar to the punch conventionally provided on the nail making machine.

The clamp mechanism 22 has two relatively movable clamp jaws, that is, a clamp jaw 30 fixed to the nail making machine, and a clamp jaw 32 reciprocable with respect to the fixed jaw 30. There is. Clamp jaw 3
In the closed configuration (Figs. 1, 3, 7) where 0, 32 are closed,
The movable jaw 32 is moved toward the fixed jaw 30,
Engages with fixed jaw 30. Clamp jaws 30, 32
In the open configuration (Fig. 5) where the movable jaw 32 is opened
Is moved far from the fixed jaw 30.

The fixed jaw 30 has a longitudinal groove 34 which extends outward so that the wire 20 can move laterally into and out of the groove 34 without sticking. It conforms to the major portion (about 210 °) of a right circular cylinder except that it has upper and lower edges 36 (FIG. 3). Movable jaw 32 has a longitudinal groove 38 that fits the smaller portion of the same cylinder (about 150 °). The cylinder has a diameter approximating that of the wire 20.

When the clamping jaws 30, 32 are closed, the clamping mechanism 22 defines a clamping axis and is arranged to clamp the wire 20 tightly within the longitudinal grooves 34, 38. It is not essential for the clamping jaws 30, 32 to meet the wire 20 to be tightened tightly. The nail maker incorporating the clamp mechanism 22 includes a mechanism Ma (FIG. 1) that causes relative movement of the clamp jaws 30, 32 between the open and closed configurations.

Clamping jaws 30, 32 allow the wire 20 to be clamped in the longitudinal grooves 34, 38 to be equal, because the longitudinal grooves 34, 38 fit into the main and smaller portions of the same cylinder, respectively. Encounter when closed in a plane distant laterally (to the left in FIGS. 1, 3 and 7) from the dividing diametrical plane. Therefore, the clamp jaws 30, 32
Burrs (not shown) that can be formed when the tab is closed
Are separated from the diametrical surface so as not to significantly interfere with the alignment of the nail 12 formed from the wire 20. In an alternative embodiment (not shown), each of the longitudinal grooves 34, 38 may be semi-cylindrical, each of which fits in one half (180) of the cylinder.

The longitudinal groove 38 of the movable jaw 32 has a hump 40 (FIGS. 5 and 9) integral with the movable jaw 32. The hump 40 is part of the wire 20 so that the shank 14 of the nail 12 is made by deforming some of the malleable wire 20 as the movable jaw 32 is moved toward the fixed jaw 30. It is shaped so as to form the keyway 42 (see FIG. 10) along it. The above-noted pending US patent application discloses similar keyways formed in the wire portion to become the shank of the nail. The keyway 42 is for the wire 20 and the clamp jaw 3 as each nail 12 is made.
Prevents relative rotation between 0 and 32. Another important function of the keyway in aligning wire nails is "Machine and method for aligning wire nails with shank keyways".
U.S. Patent Application No. 07 of October 15, 1990 to
/ 597,022.

A nail making machine incorporating the apparatus 10 includes a reciprocating feed dog mechanism M of known construction, as shown diagrammatically in FIG. 6, for feeding the wire 20 axially during the nail making process.
b. The mechanism Mb displaces the wire 20 of a predetermined length from the clamping jaws 30, 32, which is equal to the desired length of the nail to be formed.

When the clamping jaws 30 and 32 are closed, the clamping mechanism 22 has a head forming cavity 50 (FIG. 7).
To limit. The void 50 is defined by a partial void 52 in the front face 54 of the fixed jaw 30 and a partial void 56 in the front face 58 of the movable jaw 32. The front surfaces 54, 58 (FIG. 5) are coplanar. Cavity 50 (FIG. 7) has an edge 60 that is parallel to the clamp axis, but defines a radially offset axis and that, when viewed axially, fits into a perfect circle. As shown in FIGS. 2, 4, 6, and 8, the edge 60
Is frustoconical and tapers inward from the front faces 54, 58.

The cutting mechanism 24 comprises two relatively movable cutting jaws 7 which are laterally movable between a closed configuration and an open configuration.
0, 72 (FIGS. 1, 9). In the closed configuration, the cutting jaws 70, 72 are closed as shown in FIG. In the open configuration, the cutting jaws 70, 72 are open so that the wire 20 can be fed axially there between. The nail making machine incorporating the device 10 has a mechanism Mc (FIG. 1) for moving the cutting jaws 70, 72 between an open configuration and a closed configuration.

As shown in FIGS. 7 and 8, the cutting jaw 72 is
A bending finger 80 having a lower cam surface 82 is provided. The lower cam surface 82 faces downwardly toward the cutting jaw 70 at an acute angle to the horizontal plane and downwardly and rearwardly at an acute angle to the vertical plane.

As shown in FIGS. 7 and 8, the cutting jaws 70 and 7
If the predetermined length 20a of the wire 20 clamped when the 2 is moved to the closed shape extends axially from the clamp mechanism 22 along the clamp axis, the bending finger 80 will be
0a on the cam surface 82. The bending finger 80 bends the protruding portion 20a downward at an acute angle (about 20 °) with respect to the clamp axis when the cutting jaws 70, 72 are partially closed.

As shown in FIG. 9, the cutting jaw 70 has a tapered cutting blade 90. The cutting jaw 72 has a tapered cutting blade 92. The cutting blades 90, 92 are complementary so that when the cutting jaws 70, 72 are fully closed, the curved portion 20a (Fig. 8) has a conventional four-sided pointed end 16 (Figs. 2, 10). The leading portion 20b (FIG. 2) is cut from the bent length 20a so as to form a curved stub 20c protruding from the clamp mechanism 22. The cutting blades 90, 92 have the above-mentioned acute angle (approximately 2
To a known cutting jaws taper, such as the cutting jaws replaced by the cutting jaws 70, 72 except that the cutting blades 90, 92 are oriented by the wire 20 extending at 0 °) to cut the wire 20. Similar.

The cutters 70 and 72 include the bent stub 2
0c (FIG. 2) is laterally movable in the area spaced by a predetermined distance from the clamping mechanism 22 so that it has a volume approximately equal to the volume of the head forming cavity 50. Optionally, the curved stub 20c has sufficient volume to form the nail head. Cutting jaw 70,
When 72 is opened, the bent stub 20c will relieve the clamping mechanism 2 due to the inherent elastic energy of the wire 20.
It tends to rebound slightly through 2 at a slightly smaller angle (about 18 °) to the clamp axis.

A punch 26 made from tool steel (see FIG. 3,
4) is reciprocable relative to the front faces 54, 58 of the clamping jaws 30, 32 along an axis defined by the cavity 50. The punch 26 has a flat surface 96 (FIG. 4) that projects beyond the edge 60 in all radial directions from the axis of the edge 60. A nail maker incorporating the device 10 has a mechanism Md for reciprocating the punch 26 along the same axis with respect to the jaw surfaces 54, 58 so that the mechanism Md can typically be used to move the punch in the nail maker. (FIG. 4).

In each operating cycle of a nail making machine incorporating the device 10, first the clamping jaws 30, 32 are longitudinally grooved such that a predetermined length 20a of the wire 20 projects axially from the clamping mechanism 22. The wire 20 is held in the inside of 34 and 38 and closed. The cutting jaws 70, 72 are then partially closed so that the protruding portion 20a of the wire 20 to be clamped is bent by the bending finger 80 at an acute angle (about 20 °) with respect to the clamping axis defined by the clamping mechanism 22. To be

With the wire 20 still clamped, the cutting jaws 70, 72 are cut from the bent portion 20a of the leading portion 20b (FIG. 2) leaving a bent stub 20c protruding from the clamping mechanism 22. As you can see, it is completely closed. The four-pointed end portion 16 is provided at the cutting point of the leading portion 2 when the leading portion 20b is cut from the bent portion.
0b.

Next, the punch 26 pushes the bent stub 20c of the wire 20 to be tightened into the head forming space 50 by the punch surface 96 so that the stub 20c is deformed when the stub 20c is pushed. , Moved. Accordingly, the stub 20c is deformed to fill the void 50 and form a circular eccentric head 18 on the wire 20 to be tightened.

These operations of the device 10 are repeated cyclically to continue producing similar nails 12 from the wire 20. Various changes may be made in the preferred embodiment described above without departing from the spirit and scope of the invention.

Next, the embodiments of the present invention will be listed. 1. 5. The method of manufacturing a nail according to claim 4, wherein the forming procedure extends at least as far as an edge of the head forming cavity in all radial directions from the axis defined by the cavity. Engaging the bent stub by a punch having a punch, pushing the stub into the cavity by the punch surface, and moving the punch toward the clamping mechanism to deform the stub when pushing the stub. A method of manufacturing a nail including a step of moving a surface. 2. 5. The method of manufacturing a nail according to claim 4, wherein the forming procedure includes a surface extending at least as far as an edge of the head forming cavity in all radial directions from an axis defined by the cavity. In a direction parallel to the parallel axes so as to engage the curved stub by means of a punch and push the stub into the cavity by the punch surface and deform the stub when pushing the stub. A method for manufacturing a nail, comprising a step of moving the punch surface toward the clamp mechanism. 3. The method of making a nail according to claim 3, wherein the cutting procedure bends the clamped wire such that the bent wire leaves a bent stub protruding from the clamping mechanism that has sufficient volume to form a nail head. A method of making a nail, which comprises the step of cutting a leading portion from a stub, whereby the head of the nail formed from the stub tends to be perfectly circular when viewed vertically. 4. The method for manufacturing a nail according to claim 1, wherein the tightening procedure includes a step of forming a key groove along the wire when tightening the wire by the clamp mechanism. 5. In the method described in 4 above, the tightening procedure is
A method of manufacturing a nail comprising the steps of forming a keyway along a wire as it is tightened by the clamping mechanism in each iteration, such as forming a keyway in the leading portion that is cut in each iteration. 6. A method of making a nail having an elongated shank and an integral head from a malleable wire, comprising: (a) a clamping mechanism that limits the clamping axis such that a predetermined length of the wire projects axially from the clamping mechanism. Bending the wire to be tightened such that (b) the protruding portion of the tightened wire is bent at an acute angle with respect to the clamp axis, and (c) the bent stub protruding from the clamp mechanism is left. The leading portion from the cut portion to form a sharp end on the leading portion at the cutting point when the leading portion is cut, and (d) when the nail head is viewed vertically, Forming a nail head from a bent stub of a wire that has been tended to be round, (e) releasing the wire from the clamping mechanism after the forming procedure, and (f) The specified length is The released wire axially until it projects axially from the pulling mechanism, and (g) forms the shank and head of the nail from the leading portion that is cut in each iteration, possibly except in the first iteration. A method for manufacturing a nail, comprising the steps of repeating steps (a) to (f) as described above. 7. A method of manufacturing a nail having an elongated shank and an integral head from a malleable wire, the method comprising: (a) a predetermined length of the wire protruding axially from a clamping mechanism, the protruding portion being the head of the nail. Tightening the wire by a clamping mechanism that limits the clamping axis so that
Bending the protruding portion of the clamped wire at an acute angle to the clamp axis, and (c) cutting the leading portion from the bent portion of the clamped wire to leave a curved stub protruding from the clamping mechanism, Forming a sharp end on the leading portion at the cutting point when the leading portion is cut, and (d) forming a nail head from the bent stub of the tightened wire,
(E) releasing the wire from the clamping mechanism after the forming procedure, and (f) feeding the released wire axially until a predetermined length of the wire projects axially from the clamping mechanism. (G) A method of manufacturing a nail comprising the steps of repeating steps (a) to (f) to form the shank and head of the nail from the leading portion cut in each iteration. 8. The method for manufacturing a nail according to claim 8, wherein the punch is movable in a direction parallel to the parallel axes. 9. The method of manufacturing a nail according to claim 7, wherein the clamp jaw has a device that forms a key groove along the wire at a position where the wire is tightened. 10. 8. The nail manufacturing apparatus of claim 7, wherein one of the clamp jaws has a device that forms a keyway along the wire. 11. The nail manufacturing apparatus according to claim 5, wherein the bending cutting device is arranged to be relatively movable between an open shape and a closed shape, and the open shape to the closed shape. A bending finger projecting from one of the cutting jaws to configure a device for bending the protruding portion of the wire as the cutting jaw moves, and wherein the cutting jaw is moved to the closed configuration An apparatus for manufacturing a nail that cooperates to cut a bent portion of the wire. 12. 11. The nail manufacturing apparatus as described in 11 above, wherein the cutting jaw forms a sharp end on the leading portion of the wire when cutting the leading portion from the bent portion of the wire to be tightened. Device for manufacturing nails having a device.

[0035]

As described above, according to the present invention, it is possible to efficiently and economically mass-produce a large number of wire nails having circular eccentric heads arranged in strips for use in a power nailing machine. Also, the components of the novel apparatus according to the invention can replace the components of commercially available power nailers. In addition, the burr formed when manufactured by the present device can be laterally offset from the diametrical plane that bisects the nail shank so that it does not significantly interfere with nail alignment.

[Brief description of drawings]

FIG. 1 is a partial elevational view of a background closed clamp jaw and a foreground cutting jaw.

FIG. 2 is a partial cross-sectional view taken along line 2-2 of FIG. 1 showing the sharpened ends and the bent stubs.

FIG. 3 is a partial cross-sectional view along line 3-3 of FIG. 2 showing the head of the shaped nail and the dashed outline of the punch.

FIG. 4 is a view similar to FIG. 2 showing the forming of the nail head by punching.

FIG. 5 is a view similar to FIG. 3 showing the clamp jaws open.

6 is a partial cross-sectional view taken along line 6-6 of FIG.

FIG. 7 is a view similar to FIG. 3 showing the leading portion of a bent wire.

8 is a partial cross-sectional view taken along line 8-8 of FIG.

FIG. 9 is an exploded perspective view of a clamp jaw and a cutting jaw.

FIG. 10 is a perspective view of an exemplary nail with an elongated shank having a pointed end and a keyway and a circular eccentric head.

[Explanation of symbols]

 10 device 14 shank 16 sharp end 18 circular eccentric head 20 wire 20a predetermined length (protruding part, bent part) 20b leading part 20c bent stub 22 clamping mechanism 24 cutting mechanism 26 punch Mb feeding dog mechanism 30 Fixed Clamping Jaw 32 Movable Clamping Jaw 40 Knob 42 Key Groove 50 Head Forming Void 60 Edge of Void 70 Cutting Jaw 72 Cutting Jaw 80 Bending Finger 96 Punching Surface

Continuation of front page (72) Inventor William L. Gabriel United States 60010 Burlington Lakeview Parkway 78 Illinois

Claims (8)

[Claims] 1. A method of manufacturing a nail, the method comprising manufacturing a nail having an elongated shank and an integral head from a malleable wire,
(A) The wire is clamped by a clamp mechanism that limits the clamp axis so that the predetermined length of the wire projects in the axial direction from the clamp mechanism, and (b) the protruding portion of the clamped wire forms an acute angle with the clamp axis. (C) leaving a bent stub protruding from the clamping mechanism,
Cut the leading part from the bent part of the tightened wire,
(D) forming a nail head from a bent stub of a clamped wire, (e) releasing the wire from the clamp mechanism after the head forming procedure, and (f) the wire axially from the clamp mechanism for a predetermined length. Proceed to deliver the released wire axially until it protrudes, and (g) form a nail shank and head from the leading portion (g) possibly cutting at each iteration except the first. A method for manufacturing a nail, comprising a procedure of repeating steps (a) to (f). 2. The method of manufacturing a nail according to claim 1, wherein the cutting step is such that when the leading portion is cut from a bent portion of a tightened wire, a sharp end portion of the leading portion is cut at the cutting point. The manufacturing method of the nail provided with the procedure of forming a. 3. The method of manufacturing a nail according to claim 1, wherein the tightening procedure includes a procedure of tightening the wire by a clamp mechanism that limits a cavity for forming a head when tightening the wire. A method for manufacturing a nail, comprising the steps of pushing the stub into a void and deforming the stub when pushing the stub. 4. The method of manufacturing a nail according to claim 1, wherein the tightening procedure includes a procedure for tightening the wire by a clamp mechanism that limits a head forming space when tightening the wire. A bending and cutting procedure that forms a head of the nail, with an edge that matches a full circle and that defines an axis that is parallel to the clamping axis but that is radially offset from the axis. A method of manufacturing a nail, which is carried out in such a manner that the bent stub is projected substantially toward the axis defined by the void. 5. A nail manufacturing apparatus for manufacturing a nail having an elongated shank and a circular eccentric head from a malleable wire, wherein: (a) a predetermined length of the wire projects axially from a clamping mechanism. A device having a clamping mechanism for clamping the wire and limiting the clamping axis to release the wire from the clamping mechanism so as to allow the wire to be fed axially; ) A device for bending the protruding portion of the tightened wire at an acute angle with respect to the clamp axis, and (c) a device for cutting the bent portion of the tightened wire so as to leave a bent stub protruding from the clamp mechanism, (D) a device for forming a nail head from a bent stub of a clamped wire, and (e) a device for axially delivering the released wire until the leading portion of the wire projects from the clamping mechanism. And said in-process leaving is operable to be repeatable to form a shank and head of a nail from said leading portion, which is probably cut in each iteration except the first. Nail manufacturing equipment. 6. The nail manufacturing apparatus according to claim 5, wherein when the cutting device cuts the leading portion from the bent portion of the tightened wire, a sharp end of the leading portion at the cutting point. Device for manufacturing a nail having a device for forming a part. 7. The nail manufacturing apparatus according to claim 5, wherein the clamping mechanism clamps the wire in the closed configuration and releases the wire in the open configuration relative to each other. A clamping jaw arranged so as to be movable in a closed manner, the jaw defining a head-forming cavity in the closed configuration, the cavity being parallel to the clamping axis but in a radial direction. An apparatus for manufacturing a nail having an edge that matches a perfect circle when viewed in the axial direction by limiting an offset axis line. 8. The apparatus for manufacturing a nail according to claim 7, wherein the forming device has ends of the head forming cavity in all radial directions from an axis defined by the head forming cavity. A nail having at least a similarly extended surface at the edge, the punch being movable to force the stub into the cavity by the punch surface and to deform the stub when pushing the stub. Manufacturing equipment.